President Trump is at it again.

People on Twitter recently pointed out that the president left his wife, Melania, behind while deplaning Air Force One over the weekend.In one photo, the president is at the bottom of the airplanes stairs, greeting and saluting people on the ground, while Melania is still descending.

Many online criticized the distance between the two, pointing to other presidents like Barack Obama and Ronald Reagan and the way they descended the stairs with their wives.

Though Trump and his wife have descended the stairs together at the same speed a few times before and many other presidents havent always descended the stairs with their first lady the incident is part of a larger pattern of the presidents body language and etiquette toward his wife. The Huffington Post reached out to two etiquette experts, Jacqueline Whitmore andElaine Swann,to get their takes on Trumps distance in the photos.

Whitmore, an international etiquette expert who has appeared in the New York Times and shows like Fox and Friends, explained the traditional rule of etiquette when it comes to men and women descending stairs.

When a man and woman are coming down the stairs the man would go before her. The logic being that if she trips or falls, the man (generally being larger or stronger) would be in a position to catch her, she told HuffPost.That being said, Whitmore said the presidents distance in these pictures could be perceived as a sign of disrespect.

In the photographs, what were clearly seeing is that Donald Trump is walking not just one stair ahead, not two stairs ahead, but a few feet ahead. Shes not being accompanied by him, Whitmore explained. If you look at some of the old photos of Ronald and Nancy Reagan or the Obamas, they are very close together. In other words, theyre a unit, theyre a couple, theyre engaging in this activity together.

Whitmore added, Whereas in this particular photo, she is clearly standing all by herself. Now it could also be a sign of self-absorption or hes in a hurry. Hes a role model for the country, having said that – he should be modeling, I believe, a different kind of behavior.

Swann, a lifestyle and etiquette expert who has been featured in the New York Times and appeared on the Today Show,echoed Whitmores take.

The husband at the bottom of the stairs, saluting and greeting the people there, and the wife is still at the top of the stairs this is incorrect, she told HuffPost. The proper thing for him to do is to wait for his spouse at the bottom of the stairs and then take her hand and assist her down the last few steps as she comes down. This was not done.

Swann added, He still is a husband first before a president. Because hes in the presence of a woman, and this woman is his spouse, he still has to make sure that hes nurturing his relationship. And part of nurturing your relationship is the small gestures and niceties that are necessary in terms of chivalry.

During Trumps inauguration in January, the president was also criticized for not waiting for Melania to get out of the car and then leaving her behind while he greeted the Obamas.

When I look at the video [from the inauguration], this same thing rings true. President Trump should have never bounded up those steps, leaving his wife behind on the opposite side of the car, Swann said. The proper way to go up the stairs is the lady always goes first, and then the gentleman follows behind her whether you are the President or not.

Communication and body language expert Susan Constantinemightve said it best in an interview with Mic after the inauguration.

If you didnt know that they were married, you wouldnt know that they are married, she told the outlet.